الاستدلال

import { createAgent } from '@lousho/build-ai-agent';

const agent = createAgent({
  model: 'anthropic/claude-sonnet-4-5',
  instructions: 'You solve puzzles.',
  reasoning: 'medium',
});

for await (const event of agent.stream('Which weighs more, a kilo of feathers or a kilo of lead?')) {
  if (event.type === 'reasoning.delta') process.stdout.write(`\x1b[2m${event.text}\x1b[22m`);
  if (event.type === 'reasoning.done') console.log(`\n(${event.tokens ?? '?'} reasoning tokens)`);
  if (event.type === 'text.delta') process.stdout.write(event.text);
}

// One call can think harder; the object form takes a budget and a summary request.
const result = await agent.send('Prove it.', { reasoning: { effort: 'high', budgetTokens: 16_000 } });
console.log(result.reasoning, result.usage.reasoningTokens);